<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片式图区域 -->
        <el-card>
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>
            <el-table :data="rolesList" border stripe>
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template v-slot:default="scope">
                        <el-row :class="['bdbottom', i1 === 0 ? 'bdtop' : 'bdbottom', 'vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
                            <!-- 一级菜单渲染列 -->
                            <el-col :span="5">
                                <el-tag closable @close="removeRightById(scope.row, item1.id)">{{ item1.authName }}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 二级和三级菜单渲染列 -->
                            <el-col :span="19">
                                <!-- 通过for循环嵌套渲染二级权限 -->
                                <el-row :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                                    <el-col :span="6">
                                        <el-tag type='success' closable @close="removeRightById(scope.row, item2.id)">{{ item2.authName }}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <el-col :span="18">
                                        <el-tag type='warning' closable @close="removeRightById(scope.row, item3.id)" v-for="(item3) in item2.children" :key="item3.id">
                                            {{ item3.authName }}
                                        </el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                        <!-- <pre>{{ scope.row }}</pre> -->
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作">
                    <template v-slot:default="scope">
                        <el-button type="primary" icon="el-icon-edit">编辑</el-button>
                        <el-button type="danger" icon="el-icon-delete">删除</el-button>
                        <el-button type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>
        <!-- 分派权限对话框 -->
        <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%" @close="setRightDialogClosed">
            <!-- 树形结构的权限数据 -->
            <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key='id' default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>
            <span slot="footer" class="dialog-footer">
                <el-button @click="setRightDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="allotRight">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
  data () {
    return {
      // 角色列表数据
      rolesList: [],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      // 所有权限数据列表
      rightslist: [],
      // 树形控件的树形绑定对象
      treeProps: {
        children: 'children',
        label: 'authName'
      },
      // 默认选中的节点 id 值数组
      defKeys: [],
      // 当前即将分配权限的角色ID
      roleId: ''
    }
  },
  created () {
    // 获取所有角色数据
    this.getRolesList()
  },
  methods: {
    // 获取角色列表
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败')
      }
      this.rolesList = res.data
      console.log(res)
    },
    // 根据 ID 删除对应的权限
    async removeRightById (role, rightId) {
      // 弹框提示是否确认删除
      const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 如果用户取消删除操作，confirmResult 返回 cancel
      // 如果用户确认删除操作，confirmResult 返回 comfirm
      if (confirmResult !== 'confirm') {
        return this.$message.info('权限删除已取消')
      }
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) {
        this.$message.error('删除权限失败')
      }
      // 调用 getRolesList 会重新获取所有数据并重新渲染页面
      // 导致权限框关闭
      // 接口文档 ：响应数据说明--返回的data, 是当前角色下最新的权限数据
      // 因此只需要将data重新赋值即可
      // this.getRolesList()
      role.children = res.data
    },
    // 展示分配权限的对话框
    async showSetRightDialog (role) {
      this.roleId = role.id
      // 获取所有权限数据并以树形结构展示
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        this.$message.error('获取权限数据失败')
      }
      this.rightslist = res.data
      console.log(this.rightslist)
      // 递归获取三级节点ID
      this.getLeafKeys(role, this.defKeys)
      this.setRightDialogVisible = true
    },
    // 通过递归的形式 获取角色下所有三级权限的ID值， 并保存到 defKeys 数组中
    getLeafKeys (node, arr) {
      // 如果当前 node 节点不包含 children 属性，那么该节点为 三级节点
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(item => {
        this.getLeafKeys(item, arr)
      })
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed () {
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRight () {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) {
        this.$message.error('分配权限失败')
      }
      this.$message.success('分配权限成功')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag{
    margin: 7px;
}
.bdtop{
    border-top: 1px solid #eee;
}
.bdbottom{
    border-bottom: 1px solid #eee;
}
.vcenter{
    display: flex;
    align-items: center;
}
</style>
